*** (0.28) *** [Linux-HA] Website quirks

[Florian Heigl]

Hi Alan, list

2007/2/22, Alan Robertson <alanr at unix.sh>:
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> Florian Heigl wrote:
> > Hi,
> >
> > I've been reading through most or all documentation on the linux-ha
> > website and found a few little annoyances. I'm not sure if this should
> > go to bugzilla.
> >
> > http://www.linux-ha.org/ClusterInformationBase/Conversion
> > seems to be there, but lacking content.
>
> It has over 100 lines in the file as displayed on my screen. It starts
> off like this:

this must've been the proxy at my workplace, i got just the linux-ha
org headings and sidebars but no content on two different boxes I
tried. Sorry about that and thank You for pointing to the
haresources2cib.py!

> Note that if you installed Linux-HA somewhere else, then the pathnames
> need to change to match your installation.

noted :)

> - -----------------------------------------------------
>
> > http://www.linux-ha.org/FAQ#head-4e1d578a5a401280ce81ce30988a9b25c0cd1e50
> > the proposed answer does _not_ refer to an active/active
> > configuration, someone should
> > review or remove it. (EMC^2 CX vendors, consultants or MCSEs might beg
> > to differ, but I still hope some they sued appropriately some day)
>
> Active/Active is a term which has many meanings to many people.  And,
> what we mean by it is defined on the web site.  Going to what I suspect
> _you_ mean by active/active is not a function of the HA software, but in
> fact a function of the application.  So, even if you mean "parallel
> execution of the same application" not "both nodes are doing active
> work", it's permitted by Linux-HA (even release 1) - but VERY few
> applications are prepared to run that way.  Many people think that
> active/active is a property of the servers, not a property of the

I'm aware the application needs to be able to handle most of the thinking there.
but - i think the people asking / reading the faq do it for a common reason.
especially the haresources file is so straightforward that the
- proposed configuration is obvious
- one is left wondering how to go into 'parallel' mode.

side note: everyone of the people i know that deal with highly
available stuff and
most books I read so far seem to agree that active/active means there
is a parallel
processing of data. and while You might call me paranoid I get the feeling that
certain vendors seek an easy solution in redefining the term instead
of implementing
the technique.

> application.  Depends on your point of view.  R2 has specific provisions
> to manage truly parallel applications.

that's very interesting. I'll try to find them.
how about adding that last line to the faq?

> > http://linux-ha.org/download/faqntips.html (linked from the mailman
> > site) apparently
> > has no content either.
>
> That's an error.  Should be fixed now.  Thanks for pointing it out!
>
> > Also there seems to be a little lack of documentation in case someone
> > wants to start
> > with a crm - enabled configuration.
>
> No, it's just badly organized.  A good place to start might be the most
> recent tutorial found here:
>         http://linux-ha.org/HeartbeatTutorials
>
> There's even a 1.5 hour video of it - in which I joke about XML too
> much, but got pretty good reviews from the audience.  The slides online
> have about 4.5 hours more material, but the slot I had to speak in was
> only 1.5 hours - so that's all there is on the video.

I read the pdf on that, but got lost after a few dozen pages of xml, i
guess i should've
chosen the video instead!

> > Last the bugzilla url points to  OSDL and needs an update soon :)
>
> As soon as they give us a permanent URL, we'll fix it :-(

:)


Thank You for the time & information,
Florian